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1. WO2013004233 - A METHOD FOR CONTROLLING OPERATION OF A VAPOUR COMPRESSION SYSTEM IN A SUBCRITICAL AND A SUPERCRITICAL MODE

Publication Number WO/2013/004233
Publication Date 10.01.2013
International Application No. PCT/DK2012/000079
International Filing Date 03.07.2012
IPC
F25B 9/00 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
9Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point
F25B 49/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
49Arrangement or mounting of control or safety devices
02for compression type machines, plant or systems
CPC
F25B 2309/061
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2309Gas cycle refrigeration machines
06Compression machines, plant or systems characterised by the refrigerant being carbon dioxide
061with cycle highest pressure above the supercritical pressure
F25B 2400/13
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2400General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
13Economisers
F25B 2400/16
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2400General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
16Receivers
F25B 2500/19
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2500Problems to be solved
19Calculation of parameters
F25B 2600/17
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2600Control issues
17by controlling the pressure of the condenser
F25B 2600/2503
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2600Control issues
25Control of valves
2503Condenser exit valves
Applicants
  • DANFOSS A/S (AllExceptUS)
  • PRINS, Jan [DK]/[DK] (UsOnly)
Inventors
  • PRINS, Jan
Agents
  • DANFOSS A/S [DK]/[DK]
Priority Data
PA 2011 0051305.07.2011DK
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A METHOD FOR CONTROLLING OPERATION OF A VAPOUR COMPRESSION SYSTEM IN A SUBCRITICAL AND A SUPERCRITICAL MODE
(FR) PROCÉDÉ POUR COMMANDER LE FONCTIONNEMENT D'UN SYSTÈME DE COMPRESSION DE VAPEUR DANS UN MODE SOUS-CRITIQUE ET DANS UN MODE SUPERCRITIQUE
Abstract
(EN)
A method for controlling operation of a vapour compression system ( 1), and a vapour compression system ( 1) are disclosed. The vapour compression system (1) comprises a compressor (2), a heat rejecting heat exchanger (3), a controllable valve (4), a receiver (5), at least one expansion device and at least one evaporator arranged along a refrigerant path having refrigerant flowing therein. The vapour compression system (1) is capable of being operated in a subcritical control regime as well as in a supercritical control regime. The method comprises the steps of measuring a temperature, TGC, of refrigerant leaving the heat rejecting heat exchanger; calculating a pressure reference, PGC,Ref, based on the measured temperature, TGC, and using a calculation formula being applicable to the subcritical control regime as well as to the supercritical control regime; and controlling an opening degree of the controllable valve in order to obtain a pressure of refrigerant leaving the heat rejecting heat exchanger which is equal to the calculated pressure reference, PGC, Ref. Since the calculation formula is applicable to the subcritical control regime as well as to the supercritical control regime, only one calculation formula is necessary, and the vapour compression system (1) can thereby be controlled in a very easy manner.
(FR)
L'invention porte sur un système pour commander le fonctionnement d'un système de compression de vapeur (1) et sur un système de compression de vapeur (1). Le système de compression de vapeur (1) comprend un compresseur (2), un échangeur de chaleur à rejet de chaleur (3), une soupape (4) pouvant être commandée, un récepteur (5), au moins un dispositif de détente et au moins un évaporateur qui sont agencés sur la longueur d'un trajet de fluide frigorigène dans lequel circule un fluide frigorigène. Le système de compression de vapeur (1) peut être commandé dans un régime de commande sous-critique aussi bien que dans un régime de commande supercritique. Le procédé comprend les étapes consistant à mesurer une température, TGC, du fluide frigorigène quittant l'échangeur de chaleur à rejet de chaleur ; calculer une référence de pression PGC,Ref, basée sur la température mesurée, TGC, et utiliser une formule de calcul applicable au régime de commande sous-critique ainsi qu'au régime de commande supercritique ; et commander un degré d'ouverture de la vanne réglable afin d'obtenir une pression du fluide frigorigène quittant l'échangeur de chaleur à rejet de chaleur, qui est égale à la référence de pression calculée, PGC,Ref. Étant donné que la formule de calcul est applicable au régime de commande sous-critique aussi bien qu'au régime de commande supercritique, il suffit d'une seule formule de calcul et le système de compression de vapeur (1) peut ainsi être commandé très facilement.
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